Eclogites and blueschists of the Sistan Suture Zone, eastern Iran: A comparison of P–T histories from a subduction mélange

Rad, G. R. Fotoohi; Droop, G. T. R.; Amini, Sadraddin; Moazzen, Mohssen

doi:10.1016/j.lithos.2005.01.007

Cited by 68 publications

(35 citation statements)

References 30 publications

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“…The identities of the white micas in these samples were determined by X-ray diffractometry (XRD) and confirmed, in three of the samples, by electron-probe microanalysis (EPMA) (Fotoohi Rad et al 2005).…”

Section: Sample Detailsmentioning

confidence: 89%

“…200 Â 100 m 2 ) embedded in a matrix of low-grade chlorite-, talc-and mica-rich schists. The metabasites include eclogites and blueschists, the 'hallmark' lithologies of subduction zones, and have been taken as evidence that the metamorphic mélange represents partially subducted remnants of the Sistan oceanic lithosphere (Tirrul et al 1983;Fotoohi Rad et al 2005).…”

Section: Geological Settingmentioning

confidence: 99%

“…The petrography and metamorphic conditions of the metabasites and metacherts of the metamorphic mélange are described by Fotoohi Rad et al (2005).…”

Section: Sample Detailsmentioning

confidence: 99%

“…The matrix minerals are locally rimmed by fine-grained, retrograde barroisite, albite and chlorite. The K 2 O content of the paragonite is 0.80 wt.%, corresponding to 0.066 atoms of K per formula unit (Fotoohi Rad et al 2005).…”

Section: Sample Detailsmentioning

confidence: 99%

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Early Cretaceous exhumation of high‐pressure metamorphic rocks of the Sistan Suture Zone, eastern Iran

2008

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The Sistan Suture Zone (SSZ) of eastern Iran is part of the Neo-Tethyan orogenic system and formed by convergence of the Central Iranian and Afghan microcontinents. Ar-Ar ages of ca. 125 Ma have been obtained from white micas and amphibole from variably overprinted high-pressure metabasites within the Ratuk Complex of the SSZ. The metabasites, which occur as fault-bounded lenses within a subduction mélange, document peak-metamorphic conditions in eclogite or blueschist facies followed by near-isothermal decompression resulting in an epidote-amphibolite-facies overprint. 40Ar/ 39 Ar step heating experiments were performed on a phengite þ paragonite mixture from an eclogite, phengites from two amphibolites, and paragonite from a blueschist; 'best-fit' ages from these micas are, respectively, 122.8 AE 2.2, 124 AE 13, 116 AE 19 and 139 AE 19 Ma (2s error). Barroisite from an amphibolite yielded an age of 124 AE 10 Ma. The ages are interpreted as cooling ages that record the post-epidote-amphibolite stage in the exhumation of the rocks.Our results imply that both the high-pressure metamorphism and the epidote-amphibolite-facies overprint occurred prior to 125 Ma. Subduction of oceanic lithosphere along the eastern margin of the Sistan Ocean had therefore begun by Barremian (Early Cretaceous) times.

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Section: Sample Detailsmentioning

confidence: 89%

Section: Geological Settingmentioning

confidence: 99%

“…The petrography and metamorphic conditions of the metabasites and metacherts of the metamorphic mélange are described by Fotoohi Rad et al (2005).…”

Section: Sample Detailsmentioning

confidence: 99%

Section: Sample Detailsmentioning

confidence: 99%

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Early Cretaceous exhumation of high‐pressure metamorphic rocks of the Sistan Suture Zone, eastern Iran

2008

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“…There is also ample evidence emphasizing eastward subduction under the Afghan block (Camp and Griffis, 1982;Tirrul et al, 1983;Fotoohi Rad et al, 2005;Saccani et al, 2010;Angiboust et al, 2013).…”

Section: U R U M I E H -D O K H T a R V O L C A N O -P L U T O N I C mentioning

confidence: 99%

Geochemistry, zircon U-Pb age, and tectonic constraints on the Bazman granitoid complex, southeast Iran

Boomeri¹,

Bagheri²,

Ishiyama³

et al. 2016

Turkish J Earth Sci

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The Bazman granitoid complex (BGC), including a large zoned pluton, intrudes into the upper Paleozoic sedimentary cover of the Lut block. It crops out on the southern slope of the Bazman volcano in Baluchestan Province of Iran. The intrusive rocks range from gabbro to various metaluminous to weakly peraluminous granites, and they are classified as I-type magmatic series. They display geochemical characteristics of typical volcanic arc magmatism at continental margins. Major-and trace-element variation diagrams show that fractional crystallization was the major process and crustal contamination, a subordinate process during the evolution of the BGC. The decrease in CaO, MgO, Al 2 O 3 , Fe 2 O 3 , TiO 2 , P 2 O 5 , and Sr, as well as the increase of K 2 O and Rb with increasing silica, are possibly related to the fractionation of plagioclase, hornblende, apatite, and titanite, whereas the increasing K, Rb, Cs, Pb, and light rare earth elements (LREEs) can be explained by crustal contamination. The BGC rocks are enriched by large ion lithophile elements (e.g., Rb, K, Cs) and the LREEs with respect to the high field strength elements (e.g., Zr, Hf, Nb, Ta, Y) and heavy rare earth elements. New ID-TIMS U-Pb dating performed on zircon and titanite extracted from the granitic samples indicates that the BGC was emplaced during the late Cretaceous period at 83-72 Ma by subduction of the Neo-Tethyan oceanic crust beneath the Eurasian continent. Subsequently, the complex became part of the Lut block when it probably rotated counter-clockwise with respect to the Sanandaj-Sirjan zone and the Urumieh-Dokhtar volcano-plutonic belt.

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Tectonic interactions between India and Arabia since the Jurassic reconstructed from marine geophysics, ophiolite geology, and seismic tomography

2015

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Gondwana breakup since the Jurassic and the northward motion of India toward Eurasia were associated with formation of ocean basins and ophiolite obduction between and onto the Indian and Arabian margins. Here we reconcile marine geophysical data from preserved oceanic basins with the age and location of ophiolites in NW India and SE Arabia and seismic tomography of the mantle below the NW Indian Ocean. The North Somali and proto-Owen basins formed due to 160-133 Ma N-S extension between India and Somalia. Subsequent convergence destroyed part of this crust, simultaneous with the uplift of the Masirah ophiolites. Most of the preserved crust in the Owen Basin may have formed between 84 and 74 Ma, whereas the Mascarene and the Amirante basins accommodated motion between India and Madagascar/East Africa between 85 and circa 60 Ma and 75 and circa 66 Ma, respectively. Between circa 84 and 45 Ma, oblique Arabia-India convergence culminated in ophiolite obduction onto SE Arabia and NW India and formed the Carlsberg slab in the lower mantle below the NW Indian Ocean. The NNE-SSW oriented slab may explain the anomalous bathymetry in the NW Indian Ocean and may be considered a paleolongitudinal constraint for absolute plate motion. NW India-Asia collision occurred at circa 20 Ma deforming the Sulaiman ranges or at 30 Ma if the Hindu Kush slab north of the Afghan block reflects intra-Asian subduction. Our study highlights that the NW India ophiolites have no relationship with India-Asia motion or collision but result from relative India-Africa/Arabia motions instead.

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Eclogites and blueschists of the Sistan Suture Zone, eastern Iran: A comparison of P–T histories from a subduction mélange

Cited by 68 publications

References 30 publications

Early Cretaceous exhumation of high‐pressure metamorphic rocks of the Sistan Suture Zone, eastern Iran

Early Cretaceous exhumation of high‐pressure metamorphic rocks of the Sistan Suture Zone, eastern Iran

Geochemistry, zircon U-Pb age, and tectonic constraints on the Bazman granitoid complex, southeast Iran

Tectonic interactions between India and Arabia since the Jurassic reconstructed from marine geophysics, ophiolite geology, and seismic tomography

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